Are perfect-reduplication and quasi-reduplication related?

[MarcoP]

PS - it would be more interesting to link reduplications to scribal hands, and see if they were more common to any particular scribe. If they were, then it would be a hint that they are scribal errors - dittographs.

Here are the counts and % of reduplication and quasi reduplication on different sections - ZL translitaeration, no dubious spaces, only considering paragraph (P) lines. I don't know how close sections boundaries are to hand-boundaries, but these numbers suggest that both phenomena are widespread everywhere. The rows are sorted by increasing Reduplication %.

        N.Red %Red  N.Quasi %Quasi
_Herbal_B  20  0.612    63  1.928
_AstroCZ   11  0.626    24  1.367
_Pharma    16  0.738    44  2.03
_StarsQ20  75  0.743   223  2.21
_Herbal_A  68  0.907   180  2.401
_BioQ13    66  1.04    163  2.568

I counted more than 250 instances of exact reduplication (here a few text pages with no illustrations are not assigned to any section, so the total on the whole ms will be slightly higher).
For quasi reduplication, I counted EVA edit distance = 1, with both words at least 4 chars long. I found more than 600 occurrences.

In my opinion, these numbers rule out the possibility that these are all errors (some might still be of course). I believe that, in medieval manuscripts, dittographs only appear once in several tens of pages and only in some manuscripts (most manuscripts have no "exact-word-repetition" dittographs, thought they may have other more common types of errors). If one could show a long manuscript with an average of more than one exact-word dittograph per page (as perfect reduplication in the VMS) I would be very grateful. The idea that all these are errors is so reassuring, that it would be nice to be able to consider it. But I am afraid evidence is against this.

I found that the two % columns have a high correlation: 82% [EDIT: 0.85, thanks David!]. Could this be an element in favour of the two phenomena being related?